Grain boundary stability governs hardening and softening in extremely fine nanograined metals
Chinese Academy of Sciences · Institute of Metal Research · +5 more institutions
Abstract
Conventional metals become harder with decreasing grain sizes, following the classical Hall-Petch relationship. However, this relationship fails and softening occurs at some grain sizes in the nanometer regime for some alloys. In this study, we discovered that plastic deformation mechanism of extremely fine nanograined metals and their hardness are adjustable through tailoring grain boundary (GB) stability. The electrodeposited nanograined nickel-molybdenum (Ni-Mo) samples become softened for grain sizes below 10 nanometers because of GB-mediated processes. With GB stabilization through relaxation and Mo segregation, ultrahigh hardness is achieved in the nanograined samples with a plastic deformation mechanism…
Citation impact
- FWCI
- 32.92
- Percentile
- 100%
- References
- 39
Authors
5- JHJian HuCorresponding
Chinese Academy of Sciences, Institute of Metal Research
- YSYinong ShiCorresponding
Chinese Academy of Sciences, Institute of Metal Research
- XSXavier Sauvage
Centre National de la Recherche Scientifique, Normandie Université, Groupe de Physique des Matériaux, Université de Rouen Normandie
- GSGang Sha
Nanjing University of Science and Technology
- KLK. LuCorresponding
Chinese Academy of Sciences, Nanjing University of Science and Technology, Institute of Metal Research
Topics & keywords
- Softening
- Grain boundary
- Materials science
- Hardening (computing)
- Metallurgy
- Molybdenum
- Grain boundary strengthening
- Grain size